According to Jim: Goodwill Hunting

Without Cheryl's knowledge, and while she is still in Florida, Jim seizes the opportunity to transform the garage into a cigar lounge and donates all of the kids' old furniture and clothes to charity. Just as he has finished unloading the last of the baby gear, Cheryl calls Jim with a special announcement: She's pregnant with twins! Now Jim has to retrieve the stuff he gave away and get used to being a father of five.